content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import org.reactivestreams.*;
  
  import hu.akarnokd.rxjava3.util.CompositeSubscription;
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.internal.subscriptions.BasicIntQueueSubscription;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  /**
   * Terminate as soon as one of the Mono sources terminates.
   */
  final class NonoAmbIterable extends Nono {
  
      final Iterable<? extends Nono> sources;
  
      NonoAmbIterable(Iterable<? extends Nono> sources) {
          this.sources = sources;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super Void> s) {
          AmbSubscriber parent = new AmbSubscriber(s);
          s.onSubscribe(parent);
  
          try {
              for (Nono np : sources) {
                  if (parent.get() != 0) {
                      break;
                  }
                  np.subscribe(parent);
              }
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              parent.onError(ex);
          }
      }
  
      static final class AmbSubscriber extends BasicIntQueueSubscription<Void> implements Subscriber<Void> {
  
          private static final long serialVersionUID = 3576466667528056758L;
  
          final Subscriber<? super Void> downstream;
  
          final CompositeSubscription set;
  
          AmbSubscriber(Subscriber<? super Void> downstream) {
              this.downstream = downstream;
              this.set = new CompositeSubscription();
          }
  
          @Override
          public void onSubscribe(Subscription s) {
              set.add(s);
          }
  
          @Override
          public void onNext(Void t) {
              // not called
          }
  
          @Override
          public void onError(Throwable t) {
              if (compareAndSet(0, 1)) {
                  set.cancel();
                  downstream.onError(t);
              } else {
                  RxJavaPlugins.onError(t);
              }
          }
  
          @Override
          public void onComplete() {
              if (compareAndSet(0, 1)) {
                  set.cancel();
                  downstream.onComplete();
              }
          }
  
          @Override
          public void request(long n) {
              // no-op
          }
  
          @Override
          public void cancel() {
              if (compareAndSet(0, 1)) {
                  set.cancel();
              }
          }
  
          @Override
          public void clear() {
              // no-op
          }
  
          @Override
          public boolean isEmpty() {
              return true;
          }
  
          @Override
          public Void poll() throws Exception {
              return null;
          }
  
          @Override
          public int requestFusion(int mode) {
              return mode & ASYNC;
          }
      }
  }
  